Interval List Intersections

0986-Interval-List-Intersections.py

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+'''
+Given two lists of closed intervals, each list of intervals is pairwise disjoint and in sorted order.
+
+Return the intersection of these two interval lists.
+
+(Formally, a closed interval [a, b] (with a <= b) denotes the set of real numbers x with a <= x <= b.  The intersection of two closed intervals is a set of real numbers that is either empty, or can be represented as a closed interval.  For example, the intersection of [1, 3] and [2, 4] is [2, 3].)
+
+
+
+Example 1:
+Input: A = [[0,2],[5,10],[13,23],[24,25]], B = [[1,5],[8,12],[15,24],[25,26]]
+Output: [[1,2],[5,5],[8,10],[15,23],[24,24],[25,25]]
+Reminder: The inputs and the desired output are lists of Interval objects, and not arrays or lists.
+
+
+Note:
+
+0 <= A.length < 1000
+0 <= B.length < 1000
+0 <= A[i].start, A[i].end, B[i].start, B[i].end < 10^9
+NOTE: input types have been changed on April 15, 2019. Please reset to default code definition to get new method signature.
+'''
+class Solution:
+    def intervalIntersection(self, A: List[List[int]], B: List[List[int]]) -> List[List[int]]:
+        res = []
+        i = j = 0
+
+        while i < len(A) and j < len(B):
+            low = A[i][0] if A[i][0] > B[j][0] else B[j][0]
+            high = A[i][1] if A[i][1] < B[j][1] else B[j][1]
+
+            if low <= high: res.append([low, high])
+
+            if A[i][1] < B[j][1]: i += 1
+            else: j += 1
+
+        return res